diff --git a/book/external/Nested-Books b/book/external/Nested-Books
index 63b9a9e..587accb 160000
--- a/book/external/Nested-Books
+++ b/book/external/Nested-Books
@@ -1 +1 @@
-Subproject commit 63b9a9e747e3fb7511e7e98514648f5d8ee9d010
+Subproject commit 587accb350eae83cf7521a2fad5d18d6cb127698